Moritz is designing an advertisement to go with President Barack Obama's back-to-school remarks, so that Moritz’s ad should be persuasive. Option C is correct.
Since Moritz's ad is definitely targeted to students who will be the audience, in an attempt to encourage them and lure them, persuasion needs to be employed in order to attract those students,
In fact, every ad should be persuasive in order to fulfil its main goal.
To persuade means to induce (someone) to do something through reasoning or argument.
its C on E2020